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A323105 Numbers k such that 411*2^k+1 is prime. 0

%I #9 May 30 2020 14:31:16

%S 1,4,7,19,37,55,72,79,81,136,139,955,976,979,1537,1579,2292,3277,4644,

%T 6007,6391,6805,17959,25999,58327,60919,112957,117781,130204,181176,

%U 192637,459595,793944,1078339,1677196,1861627,2115559

%N Numbers k such that 411*2^k+1 is prime.

%H Ray Ballinger, <a href="http://www.prothsearch.com/index.html">Proth Search Page</a>

%H Ray Ballinger and Wilfrid Keller, <a href="http://www.prothsearch.com/riesel1a.html">List of primes k.2^n + 1 for 300 < k < 600</a>

%H Y. Gallot, <a href="http://www.utm.edu/research/primes/programs/gallot/index.html">Proth.exe: Windows Program for Finding Large Primes</a>

%H Wilfrid Keller, <a href="http://www.prothsearch.com/riesel2.html">List of primes k.2^n - 1 for k < 300</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ProthPrime.html">Proth Prime</a>

%H <a href="/index/Pri#riesel">Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime</a>

%p select(k->isprime(411*2^k+1),[$1..1000]); # _Muniru A Asiru_, Jan 04 2019

%t Select[Range[1000], PrimeQ[411*2^# + 1] &]

%K nonn,more,hard

%O 1,2

%A _Robert Price_, Jan 04 2019

%E a(37) from _Jeppe Stig Nielsen_, May 30 2020

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Last modified March 28 08:22 EDT 2024. Contains 371236 sequences. (Running on oeis4.)